KNSB FIDE
PS

Peter Sonder

Rated since January 2023

1979 Classic

RIVALRY

Nemesis
Flohr, D.R. (Dennis)
Games: 3 · Win rate: 33%
Easy Target
Meij, T. (Thomas)
Games: 3 · Win rate: 100%

The good & the bad

Best wins
HOOLSEMA, M. (MAARTEN) 2046
9869 SGS Viertallencompetitie 2024/2025 2025-04 · Friday 28 March 2025
WAKKEE, J.C. (COLIJN) 2012
5711 SOS Competitie 2022/2023 December 2022 · Tuesday 6 December 2022
HELSLOOT, J.S. (JAN) 1981
8571 KNSB competitie 2023-2024 Klasse 3 ronde 7 · Saturday 2 March 2024
SCHROËN, F. (FERRY) 1956
12992 KNSB competitie 2025-2026 Klasse 5 ronde 6 · Saturday 7 February 2026
VELDHUIZEN, D. (DIRK) 1943
12410 KNSB competitie 2025-2026 Klasse 5 Ronde 3 · Saturday 22 November 2025
Worst losses
KOSTER, J.P. (JAAP) 1765
7604 SOS Competitie 2023/2024 Oktober 2023 · Monday 2 October 2023
VELDHUIZEN, M. (MARTIN) 1879
7885 SGS Viertallencompetitie 2023/2024 November 2023 · Monday 30 October 2023
VERSTEEG, J.H. (SJACO) 1913
13790 SGS Viertallencompetitie 2025-2026 2026-06 · Monday 18 May 2026
WIJK VAN, P.A. (PETER) 1922
8071 KNSB competitie 2023-2024 Klasse 3 ronde 5 · Saturday 16 December 2023
BUZOGANY, S. (SZABOLCS) 1939
9867 SGS Viertallencompetitie 2024/2025 2025-02 · Monday 17 February 2025
No FIDE-rated tournaments found.
SGS Viertallencompetitie 2025-2026 2026-06 Wednesday 1 October 2025 +0–1=1 -21.1
SGS Viertallencompetitie 2025-2026 2026-04 Wednesday 1 October 2025 +0–0=1 -7.5
SGS Viertallencompetitie 2025-2026 2026-03 Wednesday 1 October 2025 +0–0=1 -0.3
SGS Bekercompetitie 2025-2026 2026-02 Wednesday 1 October 2025 +0–1=0 -7.1
SGS Viertallencompetitie 2025-2026 2026-01 Wednesday 1 October 2025 +0–0=1 +0.8
SGS Bekercompetitie 2025-2026 SGS Beker 2025-12 Wednesday 1 October 2025 +0–0=1 +1.0
KNSB competitie 2025-2026 Klasse 5 ronde 5 Saturday 20 September 2025 +0–0=1 -7.8
KNSB competitie 2025-2026 Klasse 5 ronde 7 Saturday 20 September 2025 +0–0=1 -8.2
KNSB competitie 2025-2026 Klasse 5 ronde 6 Saturday 20 September 2025 +1–0=0 +11.1
KNSB competitie 2025-2026 Klasse 5 ronde 4 Saturday 20 September 2025 +0–0=1 -5.1
KNSB competitie 2025-2026 Klasse 5 Ronde 3 Saturday 20 September 2025 +1–0=0 +10.5
KNSB competitie 2025-2026 Klasse 5 ronde 2 Saturday 20 September 2025 +0–0=1 -7.2
KNSB competitie 2025-2026 Klasse 5 ronde 1 Saturday 20 September 2025 +0–0=1 -1.5
Nijkerkse Schaakclub interne competitie 08-06-2026 t/m 08-06-2026 (0… Monday 8 September 2025 +1–0=0 +5.2
Nijkerkse Schaakclub interne competitie 11-05-2026 t/m 18-05-2026 (0… Monday 8 September 2025 +1–0=0 +4.3
Nijkerkse Schaakclub interne competitie 09-02-2026 t/m 16-02-2026 (0… Monday 8 September 2025 +1–0=0 +5.9
Nijkerkse Schaakclub interne competitie 05-01-2026 t/m 26-01-2026 (0… Monday 8 September 2025 +1–0=0 +4.2
Nijkerkse Schaakclub interne competitie 06-10-2025 t/m 13-10-2025 (0… Monday 8 September 2025 +1–0=0 +10.0
Nijkerkse Schaakclub interne competitie 08-09-2025 t/m 22-09-2025 (0… Monday 8 September 2025 +0–0=1 -4.3
SGS Viertallencompetitie 2024/2025 2025-04 Friday 1 November 2024 +1–1=0 -0.2
SGS Viertallencompetitie 2024/2025 2025-02 Friday 1 November 2024 +0–1=0 -14.3
SGS Viertallencompetitie 2024-12 Friday 1 November 2024 +0–0=1 +0.7
SGS Bekercompetitie 2024-11 Friday 1 November 2024 +0–0=1 -1.8
SGS Viertallencompetitie 2024-11 Friday 1 November 2024 +0–0=1 -2.3
KNSB competitie 2024-2025 Klasse 5 ronde 5 Saturday 21 September 2024 +1–0=0 +5.8
KNSB competitie 2024-2025 Klasse 5 ronde 4 Saturday 21 September 2024 +1–0=0 +8.5
KNSB competitie 2024-2025 Klasse 5 ronde 2 Saturday 21 September 2024 +1–0=0 +9.5
KNSB competitie 2024-2025 Klasse 5 ronde 1 Saturday 21 September 2024 +0–1=0 -6.3
Nijkerkse Schaakclub interne competitie 10-03-2025 t/m 17-03-2025 (06… Monday 9 September 2024 +0–0=1 -1.6
Nijkerkse Schaakclub interne competitie 27-01-2025 t/m 17-02-2025 (06… Monday 9 September 2024 +1–0=0 +6.8
Nijkerkse Schaakclub interne competitie 02-12-2024 t/m 09-12-2024 (06… Monday 9 September 2024 +0–0=1 -2.4
Nijkerkse Schaakclub interne competitie 09-09-2024 t/m 14-10-2024 (060047) Monday 9 September 2024 +3–0=0 +4.6
SOS Competitie 2024/2025 2025-02 Sunday 1 September 2024 +1–0=0 +7.2
SGS Viertallencompetitie 2023/2024 Mei 2024 Sunday 1 October 2023 +0–0=1 +0.5
SGS Viertallencompetitie 2023/2024 Maart 2024 Sunday 1 October 2023 +1–0=0 +11.5
SGS Bekercompetitie 2023/2024 2024-01 Sunday 1 October 2023 +0–0=1 +6.6
SGS Bekercompetitie 2023/2024 2023-11 Sunday 1 October 2023 +0–1=0 -10.9
SGS Viertallencompetitie 2023/2024 November 2023 Sunday 1 October 2023 +0–1=0 -16.2
Nijkerkse Schaakclub interne competitie 18-09-2023 t/m 03-06-2024 (060047) Monday 18 September 2023 +2–0=1 +3.8
KNSB competitie 2023-2024 Klasse 2 ronde 8 Saturday 16 September 2023 +0–0=1 -2.7
KNSB competitie 2023-2024 Klasse 3 ronde 7 Saturday 16 September 2023 +1–0=0 +13.4
KNSB competitie 2023-2024 Klasse 3 ronde 5 Saturday 16 September 2023 +0–1=0 -12.8
KNSB competitie 2023-2024 Klasse 3 ronde 2 Saturday 16 September 2023 +0–1=0 -8.6
SOS Competitie 2023/2024 November 2023 Friday 1 September 2023 +1–0=0 +0.3
SOS Competitie 2023/2024 Oktober 2023 Friday 1 September 2023 +0–1=0 -19.5
SOS Competitie 2023/2024 September 2023 Friday 1 September 2023 +0–0=1 -8.0
KNSB competitie 2022-2023 Klasse 3 ronde 9 Saturday 17 September 2022 +1–0=0 +4.8
KNSB competitie 2022-2023 Klasse 4 ronde 5 Saturday 17 September 2022 +0–0=1 -7.4
KNSB competitie 2022-2023 Klasse 4 ronde 4 Saturday 17 September 2022 +1–0=0 +5.0
SOS Competitie 2022/2023 Mei Monday 12 September 2022 +0–0=1 -3.4
SOS Competitie 2022/2023 April 2023(K1) Monday 12 September 2022 +1–0=1 +1.2
SOS Competitie 2022/2023 Februari 2023 Monday 12 September 2022 +1–0=0 +6.3
SOS Competitie 2022/2023 Januari 2023 Monday 12 September 2022 +1–0=0 +6.5
SOS Competitie 2022/2023 December 2022 Monday 12 September 2022 +1–0=0 +14.1

Team Competition

Current teams
Amersfoort 3
Klasse 5C · 2025-2026 · 7 games
Nijkerk 1
HK · 2025-2026 · 5 games
Past teams
Amersfoort 3
Klasse 5E · 2024-2025
Nijkerk 1
HK · 2024-2025
Nijkerk 1
3E · 2024-2025
Amersfoort 1
Klasse 2A · 2023-2024
Amersfoort 2
Klasse 3E · 2023-2024
Nijkerk 1
3E · 2023-2024
Nijkerk 1
HK · 2023-2024
Amersfoort 1
Klasse 3C · 2022-2023
Amersfoort 2
Klasse 4C · 2022-2023
S.G. Amersfoort 2
1D · 2022-2023
Amersfoort 1
Klasse 2B · 2021-2022
Amersfoort 2
Klasse 4C · 2021-2022
S.G. Amersfoort 1
HKC · 2021-2022
S.G. Amersfoort 2
1D · 2021-2022
S.G. Amersfoort 1
HKA · 2019-2020
S.G. Amersfoort 2
HKB · 2019-2020
S.G. Amersfoort 2
1A · 2018-2019

Rating History

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Peak Ratings

Classic 2014 March 1, 2026
Rapid 2014 March 1, 2026
Blitz 2014 March 1, 2026

Games

Wins 27
Losses 10
Draws 24
Win Rate 44%

Performance by Color

Color Wins Draws Losses Win Rate
White 15 16 2 45%
Black 12 8 8 43%

Recent Matches

Meij, T. (Thomas) (1740) Monday 8 June 2026 WIN +5.2
Versteeg, J.H. (Sjaco) (1913) Monday 18 May 2026 LOSS -15.2
Flohr, R.R. (Ruud) (1721) Monday 11 May 2026 WIN +4.3
Roggeband, J.W. (Jens) (1811) Tuesday 28 April 2026 DRAW -5.9
Rijsoort van, P.H. (Piet-Hein) (1762) Saturday 28 March 2026 DRAW -7.8
Halve, G.F.M. (Gerard) (1773) Thursday 12 March 2026 DRAW -7.5
Slomp, P. (Pieter) (1744) Saturday 7 March 2026 DRAW -8.2
Kate ten, G. (Gustav) (1989) Monday 16 February 2026 DRAW -0.3
Vastenburg, G. (Govert) (1793) Monday 9 February 2026 WIN +5.9
Schroën, F. (Ferry) (1956) Saturday 7 February 2026 WIN +11.1
Dieleman, M. (Marco) (2162) Saturday 31 January 2026 LOSS -7.1
Cozijnsen, J. (Jan) (1722) Monday 12 January 2026 WIN +4.2
Tijssens, R. (Rob) (1852) Saturday 13 December 2025 DRAW -5.1
Groot de, J.A. (Johan) (2027) Monday 8 December 2025 DRAW +0.8
Heijnekamp, N. (Niels) (2028) Sunday 30 November 2025 DRAW +1.0
Veldhuizen, D. (Dirk) (1943) Saturday 22 November 2025 WIN +10.5
Arends, J. (Janco) (1770) Saturday 1 November 2025 DRAW -7.2
Flohr, D.R. (Dennis) (1919) Monday 13 October 2025 WIN +10.0
Vriend, J.D. (Jan Dirk) (1948) Saturday 4 October 2025 DRAW -1.5
Flohr, M.R. (Marcel) (1869) Monday 15 September 2025 DRAW -4.3